Re: [ATM] 7 inch sphereical mirror

[Dale Eason <atmpob@yahoo.com>]

Richard,
I wonder if you have done it correctly?

Another way I tried was to input the numbers for the
sphere into Sixtests and once again the strehl is .92.

I have not tried FigureXP yet but it usually agrees
with Sixtests.

So now we have at least three different programs that
agree with one another except for your results.

Dale Eason

--- Richard <cnc@cncservo.co.uk> wrote:

> Hi Richard,
> 
> Saturday, April 12, 2008, 4:49:59 PM, you wrote:
> 
> RFLRS> I can't confirm that.  When focused at the
> 70.701% zone crossover, the
> RFLRS> Visual
> RFLRS> Strehl is about 0.92.  The RMS wavefront
> error is lambda/21.23 (550 nm)
> RFLRS> and P-V is lambda/6.33.  The RMS spot size,
> depending on what part of ZEMAX
> RFLRS> you believe is between 11.36 and 11.5 microns
> diameter.  The full spot
> RFLRS> diameter
> RFLRS> is greater than 27.83 microns.
> 
> If your figures are correct, and a Strehl of 0.92
> corresponds with an
> RMS spot size of twice the Airy disk size, then it
> makes a very good
> case to never use Visual Strehl as a guide to
> optical performance.
> 
> RFLRS> depending on what part of ZEMAX
> RFLRS> you believe
> 
> All of it. It is the premiere optical design program
> and in a class of
> its own.
> 
> -- 
> 
> Best regards,
>   Richard in the UK
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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